Interference of organic signals in highly time resolved nitrate measurements by low mass resolution aerosol mass spectrometry

Bae, Min‐Suk; Schwab, James J.; Zhang, Qi; Hogrefe, Olga; Demerjian, Kenneth L.; Weimer, S.; Rhoads, Kevin P.; Orsini, Doug; Venkatachari, Prasanna; Hopke, Philip K.

doi:10.1029/2007jd008614

Cited by 42 publications

(39 citation statements)

References 63 publications

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“…3a). The ratio of NO + 2 / NO + of NH 4 NO 3 in SV was ∼ 0.35 within the range of NO + 2 / NO + ratios reported in other studies (0.29-0.75) Bae et al, 2007;Farmer and Jimenez, 2010;Fry et al, 2013). In contrast, in the CV it was only 0.04-0.07, an order of magnitude lower.…”

Section: Determination Of Vapourizer Temperature (T V )mentioning

confidence: 62%

Evaluation of the new capture vapourizer for aerosol mass spectrometers (AMS) through laboratory studies of inorganic species

Campuzano‐Jost

Day

et al. 2017

Atmos. Meas. Tech.

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Abstract. Aerosol mass spectrometers (AMSs) and Aerosol Chemical Speciation Monitors (ACSMs) commercialized by Aerodyne are widely used to measure the non-refractory species in submicron particles. With the standard vapourizer (SV) that is installed in all commercial instruments to date, the quantification of ambient aerosol mass concentration requires the use of the collection efficiency (CE) to correct for the loss of particles due to bounce. A new capture vapourizer (CV) has been designed to reduce the need for a bouncerelated CE correction.Two high-resolution AMS instruments, one with a SV and one with a CV, were operated side by side in the laboratory. Four standard species, NH 4 NO 3 , NaNO 3 , (NH 4 ) 2 SO 4 and NH 4 Cl, which typically constitute the majority of the mass of ambient submicron inorganic species, are studied. The effect of vapourizer temperature (T v ∼ 200-800 • C) on the detected fragments, CE and size distributions are investigated. A T v of 500-550 • C for the CV is recommended. In the CV, CE was identical (around unity) for more volatile species (e.g. NH 4 NO 3 ) and comparable to or higher than the SV for less-volatile species (e.g. (NH 4 ) 2 SO 4 ), demonstrating an improvement in CE for laboratory inorganic species in the CV. The detected relative intensities of fragments of NO 3 and SO 4 species observed with the CV are different from those observed with the SV, and are consistent with additional thermal decomposition arising from the increased residence time and multiple collisions. Increased residence times with the CV also lead to broader particle size distribution measurements than with the SV. A method for estimating whether pure species will be detected in AMS sizing mode is proposed. Production of CO 2 (g) from sampled nitrate on the vapourizer surface, which has been reported for the SV, is negligible for the CV for NH 4 NO 3 and comparable to the SV for NaNO 3. . We observe an extremely consistent fragmentation for ammonium compared to very large changes for the associated anions. Together with other evidence, this indicates that it is unlikely that a major fraction of inorganic species vapourizes as intact salts in the AMS.

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Section: Determination Of Vapourizer Temperature (T V )mentioning

confidence: 62%

Evaluation of the new capture vapourizer for aerosol mass spectrometers (AMS) through laboratory studies of inorganic species

Campuzano‐Jost

Day

et al. 2017

Atmos. Meas. Tech.

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“…Several instruments were deployed at the ground-based sampling site, including trace gas monitors and instrumentation for the physical and chemical characterization of aerosol, among them an Aerosol Chemical Speciation Monitor (ACSM, Aerodyne Research Inc.). The ACSM is a compact version of the widely used Aerosol Mass Spectrometer (AMS, Aerodyne Research Inc.) (Jayne et al, 2000;Canagaratna et al, 2007). In the last decade, a number of studies have applied aerosol mass spectrometry for biomass burning aerosol characterization across a wide range of environments and burning materials (Capes et al, 2008;Aiken et al, 2010;Cubison et al, 2011;Lack et al, 2013, and references therein).…”

Section: Introductionmentioning

confidence: 99%

Ground-based aerosol characterization during the South American Biomass Burning Analysis (SAMBBA) field experiment

Brito¹,

Rizzo²,

et al. 2014

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This paper investigates the physical and chemical characteristics of aerosols at ground level at a site heavily impacted by biomass burning. The site is located near Porto Velho, Rondônia, in the southwestern part of the Brazilian Amazon rainforest, and was selected for the deployment of a large suite of instruments, among them an Aerosol Chemical Speciation Monitor. Our measurements were made during the South American Biomass Burning Analysis (SAMBBA) field experiment, which consisted of a combination of aircraft and ground-based measurements over Brazil, aimed to investigate the impacts of biomass burning emissions on climate, air quality, and numerical weather prediction over South America. The campaign took place during the dry season and the transition to the wet season in September/October 2012.During most of the campaign, the site was impacted by regional biomass burning pollution (average CO mixing ratio of 0.6 ppm), occasionally superimposed by intense (up to 2 ppm of CO), freshly emitted biomass burning plumes. Aerosol number concentrations ranged from ∼ 1000 cm −3 to peaks of up to 35 000 cm −3 (during biomass burning (BB) events, corresponding to an average submicron mass mean concentrations of 13.7 µg m −3 and peak concentrations close to 100 µg m −3 . Organic aerosol strongly dominated the submicron non-refractory composition, with an average concen-tration of 11.4 µg m −3 . The inorganic species, NH 4 , SO 4 , NO 3 , and Cl, were observed, on average, at concentrations of 0.44, 0.34, 0.19, and 0.01 µg m −3 , respectively. Equivalent black carbon (BC e ) ranged from 0.2 to 5.5 µg m −3 , with an average concentration of 1.3 µg m −3 . During BB peaks, organics accounted for over 90 % of total mass (submicron non-refractory plus BC e ), among the highest values described in the literature.We examined the ageing of biomass burning organic aerosol (BBOA) using the changes in the H : C and O : C ratios, and found that throughout most of the aerosol processing (O : C ∼ = 0.25 to O : C ∼ = 0.6), no remarkable change is observed in the H : C ratio (∼ 1.35). Such a result contrasts strongly with previous observations of chemical ageing of both urban and Amazonian biogenic aerosols. At higher levels of processing (O : C > 0.6), the H : C ratio changes with a H : C / O : C slope of −0.5, possibly due to the development of a combination of BB (H : C / O : C slope = 0) and biogenic (H : C / O : C slope = −1) organic aerosol (OA). An analysis of the OA / CO mass ratios yields very little enhancement in the OA loading with atmospheric processing, consistent with previous observations. These results indicate that negligible secondary organic aerosol (SOA) formation occurs throughout the observed BB plume Published by Copernicus Publications on behalf of the European Geosciences Union. 12070 J. Brito et al.: Ground-based aerosol characterization during SAMBBA processing, or that SOA formation is almost entirely balanced by OA volatilization.Positive matrix factorization (PMF) of the organic aerosol spectra resulted i...

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“…하지만, 분진질량분광계 는 개별 유기성분을 분석하기에 한계가 있고, 100 nm 이하의 입경분포에 대해서 분석 민감도가 급격히 떨 어지기 때문에, 아직까지는 입자의 생성 및 기원을 밝히기에 한계가 있다 (Bae et al, 2007). 따라서 각각 의 화학성분 측정 및 분석과, 입자의 입경 및 수농도 를 독립적으로 측정하여, 이에 대한 상관관계를 분석 하는 연구가 진행되고 있다 (Freutel et al, 2013).…”

Section: 황산염이온(Sounclassified

Intercomparison of Number Concentrations by CPCs using Generated Particles in Chamber

Bae¹,

Park²,

Park³

et al. 2014

Journal of Korean Society for Atmospheric Environment

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Interference of organic signals in highly time resolved nitrate measurements by low mass resolution aerosol mass spectrometry

Cited by 42 publications

References 63 publications

Evaluation of the new capture vapourizer for aerosol mass spectrometers (AMS) through laboratory studies of inorganic species

Evaluation of the new capture vapourizer for aerosol mass spectrometers (AMS) through laboratory studies of inorganic species

Ground-based aerosol characterization during the South American Biomass Burning Analysis (SAMBBA) field experiment

Intercomparison of Number Concentrations by CPCs using Generated Particles in Chamber

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